Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fccd37da2c2a189…

MALICIOUS

PDF

86.4 KB Created: 2021-08-21 17:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c54d2ba2f9487a1b9528da67e8d745a8 SHA-1: 1db4c87968e3bb50e53d3cf71598c062f49ffa7f SHA-256: 5fccd37da2c2a18918c783c6c71ef1f5f5eb3db5df9aa5187cd6858db1ce679e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ekonopuntos.com/campannas/file/watug.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607076dbcda10---66958535946.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/kevuxopowono.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/letiba.pdfIn PDF document text
    • https://wrd13.com/force/file/dabepanowitakirudevopu.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/56347856177.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/tijeladan.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc6555917---90315529826.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04fa26395---gukuvaw.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/nonosag.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16085f3847f315---tefinatanogoberekoderozu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160900d5d6d7d0---91295849746.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/2373064762.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160728321c515b---78309185292.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/89134076870.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/056321dee8d1eb1b9f5a55451a6126bf/vovakavetotumidogi.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/49826566489.pdfIn PDF document text
    • http://anpo.vn/upload/files/gegusedojut.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/dfi2cu6dg1g2mr6c5hvmen2s72/38682737138.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f24d70d3f---xexuguxaxekex.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/xemuxek.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210616_F8E8E138E17DF5BF.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/jafotar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+probability+theory+hoel+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 10852 bytes
SHA-256: 5f982bc779e5b988044f0be8f6e0d782b38528c1b767bc50b75ca90a88323542
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 20028 bytes
SHA-256: 6d3d22cffdca0ea7cfc40f21f7bf816d295faa6637bfaf4dd49c334c0afe1329
font_02_sfnt_off0001330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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